SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '', 
    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 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (3923, 897, 895, 3924) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00027

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": "3",
      "used_key_parts": ["product_id"],
      "rows": 4,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (3923,897,895,3924)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
895 <p> For use with the VX-350 Series portables in the VAC-UNI charger only (CD-58 cradle).</p> vx-350 battery, vx350 battery, vx 350 battery
897 <p> 7.4 V 2300 mAh UNI high capacity battery for the VX-231 portable. </p> vx-230 battery, vx230 battery, vx 230 battery, vx-231 battery, vx231 battery, vx 231 battery
3923 <p> 7.4V 2300 mAh UNI HIGH CAPACITY battery for the VX-450 Series and the EVX Series. </p><p> VAC-UNI charger only </p> vx-450 battery, vx450 battery, vx 450 battery, vx-451 battery, vx451 battery, vx 451 battery, vx-454 battery, vx454 battery, vx 454 battery, vx-459 battery, vx459 battery, vx 459 battery, evx-530 battery, evx530 battery, evx 530 battery, evx-260 battery, evx260 battery, evx 260 battery, evx-261 battery, evx261 battery, evx 261 battery, vx-260 battery, vx260 battery, vx 260 battery, vx-261 battery, vx261 battery, vx 261 battery, vx-264 battery, vx264 battery, vx 264 battery
3924 <p> UNI I.S. battery for EVX-531, EVX-534, EVX-539, VX-451, VX-454, VX-459. For use with the VAC-UNI and VAC-6058 (MUC) chargers.</p> VX-450IS Battery, EVX-530IS Battery, Vertex Standard OEM Batteries, FNBV134IS, FNBV134LIIS, FNB-134LIIS, FNB-V134, Vertex IS battery, Vertex IS batteries, Vertex Standard IS battery, Vertex Standard IS batteries