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.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    322, 311, 312, 744, 742, 837, 537, 839, 
    621, 1048, 1049, 1014, 575, 1034, 1243, 
    1073, 1295, 497, 704, 700, 702, 705, 
    709, 698
  ) 
  AND cscart_product_descriptions.lang_code = 'vi'

Query time 0.00113

JSON explain

{
  "query_block": {
    "select_id": 1,
    "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"],
      "rows": 24,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (322,311,312,744,742,837,537,839,621,1048,1049,1014,575,1034,1243,1073,1295,497,704,700,702,705,709,698) and cscart_product_descriptions.lang_code = 'vi'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
311
312
322
497
537
575
621
698
700
702
704
705
709
742
744
837
839
1014
1034
1048
1049
1073
1243
1295