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 (
    1265, 4305, 1669, 4422, 2066, 1249, 2063, 
    1391, 1227, 1392, 2592, 1293, 2160, 
    2158, 1242, 1398, 2156, 2061, 1402, 
    1345, 1365, 2292, 1248, 4852, 2065, 
    2062, 1315, 2099, 2467, 1405, 1305, 
    2330, 2386, 1397, 2064, 1969, 2508, 
    1275, 1444, 5335, 5495, 2219, 5456, 
    2007
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00124

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "35.22"
    },
    "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": 44,
            "rows_produced_per_join": 44,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "15.42",
              "eval_cost": "4.40",
              "prefix_cost": "19.82",
              "data_read_per_join": "50K"
            },
            "used_columns": [
              "variant_id",
              "color",
              "position"
            ],
            "attached_condition": "(`unicomps`.`cscart_product_feature_variants`.`variant_id` in (1265,4305,1669,4422,2066,1249,2063,1391,1227,1392,2592,1293,2160,2158,1242,1398,2156,2061,1402,1345,1365,2292,1248,4852,2065,2062,1315,2099,2467,1405,1305,2330,2386,1397,2064,1969,2508,1275,1444,5335,5495,2219,5456,2007))"
          }
        },
        {
          "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": [
              "unicomps.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 44,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "11.00",
              "eval_cost": "4.40",
              "prefix_cost": "35.22",
              "data_read_per_join": "137K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}