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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    192, 230, 231, 232, 233, 234, 235, 236, 
    237, 238, 239, 193, 240, 241, 242, 243, 
    194, 195, 198, 199, 77, 82, 84, 85, 83, 
    89, 164, 142, 92, 165, 78, 67
  ) 
  AND cscart_product_descriptions.lang_code = 'vi'

Query time 0.00068

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "product_id",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 32,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (192,230,231,232,233,234,235,236,237,238,239,193,240,241,242,243,194,195,198,199,77,82,84,85,83,89,164,142,92,165,78,67) and cscart_product_descriptions.lang_code = 'vi'"
    }
  }
}

Result

product_id short_description full_description
67 <p>DORITHRICIN TAB 20'S PRODUCT DESCRIPTION</p>
77 SHORT DESCRIPTION
78 SHORT DESCRIPTION
82 SHORT DESCRIPTION
83 SHORT DESCRIPTION
84 SHORT DESCRIPTION
85 SHORT DESCRIPTION
89 <p>Promo Product</p>
92 SHORT DESCRIPTION
142
164 <p>Imported as VN lang</p>
165 <p>002 has a descriptionImported as VN lang</p>
192
193
194
195
198
199
230
231
232
233
234
235
236
237
238
239
240
241
242
243