SELECT 
  cscart_product_feature_variants.variant_id, 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variants.color, 
  cscart_product_feature_variant_descriptions.variant, 
  cscart_product_feature_variant_descriptions.brand_logo 
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 (
    10449, 20886, 20887, 20888, 20891, 20932, 
    20933, 27572, 51631, 35783, 19048, 
    52409, 0, 29826, 20846, 20912, 28494, 
    51612, 40115, 40332, 20856, 34540, 
    37885, 48122, 53384, 20855, 20868, 
    20909, 49840, 20866, 21747, 27559, 
    35798, 22924, 55740, 34314, 10348
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00159

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "34.58"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_product_feature_variants",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY",
              "variant_feature_idx",
              "idx_var_feat_pos"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 37,
            "rows_produced_per_join": 37,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "12.98",
              "eval_cost": "3.70",
              "prefix_cost": "16.68",
              "data_read_per_join": "42K"
            },
            "used_columns": [
              "variant_id",
              "color",
              "position"
            ],
            "attached_condition": "(`cscart_db`.`cscart_product_feature_variants`.`variant_id` in (10449,20886,20887,20888,20891,20932,20933,27572,51631,35783,19048,52409,0,29826,20846,20912,28494,51612,40115,40332,20856,34540,37885,48122,53384,20855,20868,20909,49840,20866,21747,27559,35798,22924,55740,34314,10348))"
          }
        },
        {
          "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": [
              "cscart_db.cscart_product_feature_variants.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 37,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "14.21",
              "eval_cost": "3.70",
              "prefix_cost": "34.59",
              "data_read_per_join": "276K"
            },
            "used_columns": [
              "variant_id",
              "variant",
              "lang_code",
              "brand_logo"
            ]
          }
        }
      ]
    }
  }
}