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 (
    1389, 2355, 1659, 1660, 1904, 1288, 1935, 
    2290, 2417, 1836, 1954, 1712, 1202, 
    1912, 2000, 2378, 2538, 2537, 1905, 
    1789, 2499, 1787, 1900, 1899, 2539
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00091

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "26.26"
    },
    "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": 25,
            "rows_produced_per_join": 25,
            "filtered": "100.00",
            "index_condition": "(`test2_gaseus`.`cscart_product_feature_variants`.`variant_id` in (1389,2355,1659,1660,1904,1288,1935,2290,2417,1836,1954,1712,1202,1912,2000,2378,2538,2537,1905,1789,2499,1787,1900,1899,2539))",
            "cost_info": {
              "read_cost": "15.01",
              "eval_cost": "2.50",
              "prefix_cost": "17.51",
              "data_read_per_join": "28K"
            },
            "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": [
              "test2_gaseus.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 25,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "6.25",
              "eval_cost": "2.50",
              "prefix_cost": "26.26",
              "data_read_per_join": "77K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}