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 (
    2061, 2078, 2118, 1666, 2506, 3933, 3745, 
    3779, 3780, 3781, 4743, 4009, 4013, 
    3705, 4116, 4123, 3961, 5110, 4904, 
    4952, 5225, 6275, 6802, 6849, 6856, 
    6861, 6868, 6979, 7131, 6600, 7203, 
    7238, 7239, 7277, 7290, 7340, 7202, 
    7325, 1665, 7346, 7483, 8834, 1945, 
    7871, 8262, 8315, 8539, 9152, 9499, 
    8157
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00139

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "52.51"
    },
    "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": 50,
            "rows_produced_per_join": 50,
            "filtered": "100.00",
            "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_feature_variants`.`variant_id` in (2061,2078,2118,1666,2506,3933,3745,3779,3780,3781,4743,4009,4013,3705,4116,4123,3961,5110,4904,4952,5225,6275,6802,6849,6856,6861,6868,6979,7131,6600,7203,7238,7239,7277,7290,7340,7202,7325,1665,7346,7483,8834,1945,7871,8262,8315,8539,9152,9499,8157))",
            "cost_info": {
              "read_cost": "30.01",
              "eval_cost": "5.00",
              "prefix_cost": "35.01",
              "data_read_per_join": "57K"
            },
            "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": [
              "softwarepirmam_hewadelivard_cscart_4.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 50,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "12.50",
              "eval_cost": "5.00",
              "prefix_cost": "52.51",
              "data_read_per_join": "151K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}