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 (
    422676, 427654, 406498, 438920, 440047, 
    403424, 402161, 426357, 413770, 421856, 
    453293, 421836, 444708, 429476, 413127, 
    407471, 409966, 403355, 408795, 420652, 
    443583, 442532, 408975, 443876
  ) 
  AND cscart_product_descriptions.lang_code = 'ar'

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 (422676,427654,406498,438920,440047,403424,402161,426357,413770,421856,453293,421836,444708,429476,413127,407471,409966,403355,408795,420652,443583,442532,408975,443876) and cscart_product_descriptions.lang_code = 'ar'"
        }
      }
    ]
  }
}