SELECT 
  cscart_product_feature_variants.variant_id, 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variants.color, 
  cscart_product_feature_variant_descriptions.variant 
FROM 
  cscart_product_feature_variants 
  LEFT JOIN cscart_product_feature_variant_descriptions ON cscart_product_feature_variants.variant_id = cscart_product_feature_variant_descriptions.variant_id 
  AND cscart_product_feature_variant_descriptions.lang_code = 'ru' 
WHERE 
  cscart_product_feature_variants.variant_id IN (
    3, 42, 58, 154, 173, 120, 127, 149, 123, 
    172, 146, 176, 31, 57, 299, 296, 147, 
    298, 1, 26, 260, 237, 262, 263, 264, 265, 
    258, 125, 234, 267, 238
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00079

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "32.56"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_product_feature_variants",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 31,
            "rows_produced_per_join": 31,
            "filtered": "100.00",
            "index_condition": "(`test_uchur_k`.`cscart_product_feature_variants`.`variant_id` in (3,42,58,154,173,120,127,149,123,172,146,176,31,57,299,296,147,298,1,26,260,237,262,263,264,265,258,125,234,267,238))",
            "cost_info": {
              "read_cost": "18.61",
              "eval_cost": "3.10",
              "prefix_cost": "21.71",
              "data_read_per_join": "47K"
            },
            "used_columns": [
              "variant_id",
              "color",
              "position"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_product_feature_variant_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "test_uchur_k.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 31,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "7.75",
              "eval_cost": "3.10",
              "prefix_cost": "32.56",
              "data_read_per_join": "96K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}