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 = 'en' 
WHERE 
  cscart_product_feature_variants.variant_id IN (
    39, 41, 44, 46, 47, 48, 49, 50, 51, 52, 53, 
    54, 55, 56, 45, 58, 59, 60, 61, 62, 63, 
    64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 
    74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 
    84, 92, 88, 89, 91, 93, 94, 95, 97, 98, 
    99, 100, 101, 102, 103, 104, 106, 108, 
    109, 110, 111, 114, 121, 112, 115, 117, 
    135, 136, 1201, 1200, 1199, 1195, 1194, 
    1193
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00095

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "270.01"
    },
    "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": 75,
            "rows_produced_per_join": 75,
            "filtered": "100.00",
            "index_condition": "(`danishecarter_31jan`.`cscart_product_feature_variants`.`variant_id` in (39,41,44,46,47,48,49,50,51,52,53,54,55,56,45,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,92,88,89,91,93,94,95,97,98,99,100,101,102,103,104,106,108,109,110,111,114,121,112,115,117,135,136,1201,1200,1199,1195,1194,1193))",
            "cost_info": {
              "read_cost": "165.01",
              "eval_cost": "15.00",
              "prefix_cost": "180.01",
              "data_read_per_join": "198K"
            },
            "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": [
              "danishecarter_31jan.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 75,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "75.00",
              "eval_cost": "15.00",
              "prefix_cost": "270.01",
              "data_read_per_join": "226K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}