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 (
    6889, 6892, 6891, 6890, 6823, 6888, 6893, 
    6887, 6901
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00029

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": 9,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (6889,6892,6891,6890,6823,6888,6893,6887,6901)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
6823
6887 <p>Swivel carry holster for TLK110. Comes standard with the radio package.</p> TLK110 holster, TLK 110 holster, TLK110 carry clip, TLK 110 carry clip, TLK110 clip, TLK 110 clip
6888 <p>TLK110 battery door cover</p> TLK 110 battery door, TLK110 battery door
6889 <p>7.5W USB-A power supply adapter. Universal USB-A Detachable.</p>
6890 <p>Over-the-Ear Earpiece, 2.5mm Single Pin, Straight</p> TLK110, TLK-110, TLK 110, PMLN-8077, PMLN-8077A
6891 <p>Over-the-Ear Earpiece, 2.5mm Single Pin, Straight (Short Cord)</p> TLK110, TLK 110, TLK-110, R5, R7, PMLN-8125, PMLN-8125A
6892 <p>1-Wire Surveillance Kit with Translucent Tube, 2.5mm Single Pin, Straight</p> TLK110, TLK 110, TLK-110, PMLN-8190, PMLN-8190A
6893 <p>TLK110 Replacement LTE Antenna (North America)</p> TLK 110, TLK110 antenna, TLK 110 antenna, TLK110 LTE antenna, TLK 110 LTE antenna
6901 <p>Multi-unit desktop charger for TLK110 with US/NA power supply & cable.</p>