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SELECT 
  v.product_id, 
  v.feature_id, 
  v.value, 
  v.value_int, 
  v.variant_id, 
  f.feature_type, 
  fd.description, 
  fd.prefix, 
  fd.suffix, 
  vd.variant, 
  f.parent_id, 
  f.position, 
  gf.position as gposition 
FROM 
  cscart_product_features as f 
  LEFT JOIN cscart_product_features_values as v ON v.feature_id = f.feature_id 
  LEFT JOIN cscart_product_features_descriptions as fd ON fd.feature_id = v.feature_id 
  AND fd.lang_code = 'ru' 
  LEFT JOIN cscart_product_feature_variants fv ON fv.variant_id = v.variant_id 
  LEFT JOIN cscart_product_feature_variant_descriptions as vd ON vd.variant_id = fv.variant_id 
  AND vd.lang_code = 'ru' 
  LEFT JOIN cscart_product_features as gf ON gf.feature_id = f.parent_id 
  AND gf.feature_type = 'G' 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = f.feature_id 
    AND cscart_ult_objects_sharing.share_company_id = 1 
    AND cscart_ult_objects_sharing.share_object_type = 'product_features'
  ) 
WHERE 
  f.status IN ('A') 
  AND v.product_id in (52, 131) 
  AND f.display_on_catalog = 'Y' 
  AND (
    f.categories_path = '' 
    OR FIND_IN_SET(5, f.categories_path) 
    OR FIND_IN_SET(9, f.categories_path) 
    OR FIND_IN_SET(40, f.categories_path) 
    OR FIND_IN_SET(42, f.categories_path)
  ) 
  AND IF(
    f.parent_id, 
    (
      SELECT 
        status 
      FROM 
        cscart_product_features as df 
      WHERE 
        df.feature_id = f.parent_id
    ), 
    'A'
  ) IN ('A') 
  AND (
    v.variant_id != 0 
    OR (
      f.feature_type != 'C' 
      AND v.value != ''
    ) 
    OR (f.feature_type = 'C') 
    OR v.value_int != ''
  ) 
  AND v.lang_code = 'ru' 
ORDER BY 
  fd.description, 
  fv.position

Query time 0.00212

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "49.71"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "v",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY",
              "fl",
              "variant_id",
              "lang_code",
              "product_id",
              "fpl",
              "idx_product_feature_variant_id"
            ],
            "key": "product_id",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 69,
            "rows_produced_per_join": 35,
            "filtered": "51.30",
            "index_condition": "(`test_uchur_k`.`v`.`product_id` in (52,131))",
            "cost_info": {
              "read_cost": "28.02",
              "eval_cost": "3.54",
              "prefix_cost": "31.56",
              "data_read_per_join": "27K"
            },
            "used_columns": [
              "feature_id",
              "product_id",
              "variant_id",
              "value",
              "value_int",
              "lang_code"
            ],
            "attached_condition": "((`test_uchur_k`.`v`.`lang_code` = 'ru') and (`test_uchur_k`.`v`.`feature_id` is not null))"
          }
        },
        {
          "table": {
            "table_name": "f",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "status"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "feature_id"
            ],
            "key_length": "3",
            "ref": [
              "test_uchur_k.v.feature_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "9.31",
            "cost_info": {
              "read_cost": "8.85",
              "eval_cost": "0.33",
              "prefix_cost": "43.95",
              "data_read_per_join": "6K"
            },
            "used_columns": [
              "feature_id",
              "feature_type",
              "categories_path",
              "parent_id",
              "display_on_catalog",
              "status",
              "position"
            ],
            "attached_condition": "((`test_uchur_k`.`f`.`status` = 'A') and (`test_uchur_k`.`f`.`display_on_catalog` = 'Y') and ((`test_uchur_k`.`f`.`categories_path` = '') or (0 <> find_in_set(5,`test_uchur_k`.`f`.`categories_path`)) or (0 <> find_in_set(9,`test_uchur_k`.`f`.`categories_path`)) or (0 <> find_in_set(40,`test_uchur_k`.`f`.`categories_path`)) or (0 <> find_in_set(42,`test_uchur_k`.`f`.`categories_path`))) and (if(`test_uchur_k`.`f`.`parent_id`,(/* select#2 */ select `test_uchur_k`.`df`.`status` from `test_uchur_k`.`cscart_product_features` `df` where (`test_uchur_k`.`df`.`feature_id` = `test_uchur_k`.`f`.`parent_id`)),'A') = 'A') and ((`test_uchur_k`.`v`.`variant_id` <> 0) or ((`test_uchur_k`.`f`.`feature_type` <> 'C') and (`test_uchur_k`.`v`.`value` <> '')) or (`test_uchur_k`.`f`.`feature_type` = 'C') or (`test_uchur_k`.`v`.`value_int` <> 0)))",
            "attached_subqueries": [
              {
                "dependent": true,
                "cacheable": false,
                "query_block": {
                  "select_id": 2,
                  "cost_info": {
                    "query_cost": "0.35"
                  },
                  "table": {
                    "table_name": "df",
                    "access_type": "eq_ref",
                    "possible_keys": [
                      "PRIMARY"
                    ],
                    "key": "PRIMARY",
                    "used_key_parts": [
                      "feature_id"
                    ],
                    "key_length": "3",
                    "ref": [
                      "test_uchur_k.f.parent_id"
                    ],
                    "rows_examined_per_scan": 1,
                    "rows_produced_per_join": 1,
                    "filtered": "100.00",
                    "cost_info": {
                      "read_cost": "0.25",
                      "eval_cost": "0.10",
                      "prefix_cost": "0.35",
                      "data_read_per_join": "1K"
                    },
                    "used_columns": [
                      "feature_id",
                      "status"
                    ]
                  }
                }
              }
            ]
          }
        },
        {
          "table": {
            "table_name": "fd",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "feature_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "test_uchur_k.v.feature_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.82",
              "eval_cost": "0.33",
              "prefix_cost": "45.10",
              "data_read_per_join": "7K"
            },
            "used_columns": [
              "feature_id",
              "description",
              "prefix",
              "suffix",
              "lang_code"
            ]
          }
        },
        {
          "table": {
            "table_name": "fv",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id"
            ],
            "key_length": "3",
            "ref": [
              "test_uchur_k.v.variant_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.82",
              "eval_cost": "0.33",
              "prefix_cost": "46.26",
              "data_read_per_join": "5K"
            },
            "used_columns": [
              "variant_id",
              "position"
            ]
          }
        },
        {
          "table": {
            "table_name": "vd",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "test_uchur_k.fv.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.82",
              "eval_cost": "0.33",
              "prefix_cost": "47.41",
              "data_read_per_join": "10K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        },
        {
          "table": {
            "table_name": "gf",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "feature_id"
            ],
            "key_length": "3",
            "ref": [
              "test_uchur_k.f.parent_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.82",
              "eval_cost": "0.33",
              "prefix_cost": "48.56",
              "data_read_per_join": "6K"
            },
            "used_columns": [
              "feature_id",
              "feature_type",
              "position"
            ],
            "attached_condition": "<if>(is_not_null_compl(gf), (`test_uchur_k`.`gf`.`feature_type` = 'G'), true)"
          }
        },
        {
          "table": {
            "table_name": "cscart_ult_objects_sharing",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "share_object_id",
              "share_company_id",
              "share_object_type"
            ],
            "key_length": "159",
            "ref": [
              "test_uchur_k.v.feature_id",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "0.82",
              "eval_cost": "0.33",
              "prefix_cost": "49.72",
              "data_read_per_join": "527"
            },
            "used_columns": [
              "share_company_id",
              "share_object_id",
              "share_object_type"
            ],
            "attached_condition": "(`test_uchur_k`.`cscart_ult_objects_sharing`.`share_object_id` = `test_uchur_k`.`v`.`feature_id`)"
          }
        }
      ]
    }
  }
}

Result

product_id	feature_id	variant_id	feature_type	description	variant	position
52	1	1	E	Бренд	UCHUR	0
131	1	1	E	Бренд	UCHUR	0
52	55	509	S	Модель	FORESTER	20
131	55	160	S	Модель	TUKULAN	20
52	56	122	M	Назначение	Активный отдых	30
52	56	120	M	Назначение	Туризм	30
131	56	120	M	Назначение	Туризм	30
131	56	121	M	Назначение	Город	30
52	56	121	M	Назначение	Город	30
131	56	122	M	Назначение	Активный отдых	30
131	36	95	S	Регулируемый пояс	Пуговицы	330
52	6	50	M	Сезонность	Демисезон	40
131	6	58	M	Сезонность	Лето	40
131	6	50	M	Сезонность	Демисезон	40
52	3	21	S	Таблица размеров	32x30	490
131	3	15	S	Таблица размеров	34x30	490
52	39	320	S	Цвет	Черный/Серый	510
131	39	98	S	Цвет	Бежевый	510