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 (
    1, 6, 58, 238, 239, 127, 149, 123, 125, 
    234, 147, 236, 19, 50, 162, 265, 282, 
    504, 122, 240, 126, 270, 507, 7, 54, 262, 
    281, 120, 287, 24, 57, 111, 421, 422, 
    424, 289, 426, 12, 462, 121, 26, 263, 
    290, 294, 30, 1300, 1297, 1298, 1299, 
    1303, 11, 303, 304, 110, 1305, 302, 1453, 
    260, 264, 258, 267, 250, 152, 146, 494, 
    326, 508, 10, 313, 211, 251, 9, 311, 158
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00127

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "77.71"
    },
    "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": 74,
            "rows_produced_per_join": 74,
            "filtered": "100.00",
            "index_condition": "(`test_uchur_k`.`cscart_product_feature_variants`.`variant_id` in (1,6,58,238,239,127,149,123,125,234,147,236,19,50,162,265,282,504,122,240,126,270,507,7,54,262,281,120,287,24,57,111,421,422,424,289,426,12,462,121,26,263,290,294,30,1300,1297,1298,1299,1303,11,303,304,110,1305,302,1453,260,264,258,267,250,152,146,494,326,508,10,313,211,251,9,311,158))",
            "cost_info": {
              "read_cost": "44.41",
              "eval_cost": "7.40",
              "prefix_cost": "51.81",
              "data_read_per_join": "114K"
            },
            "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": 74,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "18.50",
              "eval_cost": "7.40",
              "prefix_cost": "77.71",
              "data_read_per_join": "230K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}