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 (
    18937, 18940, 18943, 19227, 19015, 23270, 
    23320, 23269, 23209, 23189, 19254, 
    19288, 23333, 23336, 23335, 23268, 
    19242, 23332, 23300, 23334, 23302, 
    23264, 23208, 23329, 23330, 23331, 
    23301, 19253, 23340, 19245, 19239, 
    18942, 23267, 23299, 23298, 19198, 
    19046, 23423, 23422, 23421, 23420, 
    18941, 19002, 23424, 18938
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00191

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "162.01"
    },
    "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": 45,
            "rows_produced_per_join": 45,
            "filtered": "100.00",
            "index_condition": "(`danishecarter_latest`.`cscart_product_feature_variants`.`variant_id` in (18937,18940,18943,19227,19015,23270,23320,23269,23209,23189,19254,19288,23333,23336,23335,23268,19242,23332,23300,23334,23302,23264,23208,23329,23330,23331,23301,19253,23340,19245,19239,18942,23267,23299,23298,19198,19046,23423,23422,23421,23420,18941,19002,23424,18938))",
            "cost_info": {
              "read_cost": "99.01",
              "eval_cost": "9.00",
              "prefix_cost": "108.01",
              "data_read_per_join": "118K"
            },
            "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_latest.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 45,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "45.00",
              "eval_cost": "9.00",
              "prefix_cost": "162.01",
              "data_read_per_join": "136K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}