SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    415347, 402013, 418477, 419869, 431915, 
    453929, 458176, 459246, 419342, 450112, 
    402856, 425249, 406919, 429651, 446530, 
    432652, 459363, 412904, 415849, 422420, 
    447660, 459541, 416465, 431024
  ) 
  AND cscart_product_descriptions.lang_code = 'zh'

Query time 0.00066

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.04252208,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_descriptions",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "product_id"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["product_id", "lang_code"],
          "loops": 1,
          "rows": 24,
          "cost": 0.04252208,
          "filtered": 100,
          "attached_condition": "cscart_product_descriptions.product_id in (415347,402013,418477,419869,431915,453929,458176,459246,419342,450112,402856,425249,406919,429651,446530,432652,459363,412904,415849,422420,447660,459541,416465,431024) and cscart_product_descriptions.lang_code = 'zh'"
        }
      }
    ]
  }
}