SELECT 
  pf.feature_id, 
  pf.feature_style, 
  pf.position, 
  pf.purpose, 
  pf.display_on_catalog, 
  pfd.description, 
  pfd.internal_name, 
  pfd.prefix, 
  pfd.suffix, 
  (
    CASE WHEN pf.purpose = 'group_catalog_item' THEN 0 ELSE 1 END
  ) AS purpose_position 
FROM 
  cscart_product_features AS pf 
  INNER JOIN cscart_product_features_descriptions AS pfd ON pf.feature_id = pfd.feature_id 
  AND pfd.lang_code = 'vi' 
WHERE 
  pf.feature_id IN (
    25127, 24832, 20381, 20511, 23779, 23780, 
    25022, 25021, 23699, 23700, 20665, 
    20539, 23693, 23692, 20532, 20990, 
    22243, 22245, 20836, 23777, 24181, 
    24182
  ) 
ORDER BY 
  purpose_position ASC, 
  pf.position ASC, 
  pf.feature_id ASC

Query time 0.00706

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "read_sorted_file": {
          "filesort": {
            "sort_key": "case when pf.purpose = 'group_catalog_item' then 0 else 1 end, pf.position, pf.feature_id",
            "table": {
              "table_name": "pf",
              "access_type": "range",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["feature_id"],
              "rows": 22,
              "filtered": 100,
              "index_condition": "pf.feature_id in (25127,24832,20381,20511,23779,23780,25022,25021,23699,23700,20665,20539,23693,23692,20532,20990,22243,22245,20836,23777,24181,24182)"
            }
          }
        }
      },
      {
        "table": {
          "table_name": "pfd",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["feature_id", "lang_code"],
          "ref": ["dev_db.pf.feature_id", "const"],
          "rows": 1,
          "filtered": 100,
          "index_condition": "pfd.lang_code = 'vi'"
        }
      }
    ]
  }
}