Sandbox

SELECT 
  cscart_ult_product_descriptions.product_id, 
  cscart_ult_product_descriptions.short_description, 
  IF(
    cscart_ult_product_descriptions.short_description = "", 
    cscart_ult_product_descriptions.full_description, 
    ""
  ) AS full_description, 
  cscart_ult_product_descriptions.meta_keywords, 
  cscart_ult_product_descriptions.meta_description, 
  cscart_ult_product_descriptions.search_words, 
  cscart_ult_product_descriptions.promo_text 
FROM 
  cscart_ult_product_descriptions 
WHERE 
  cscart_ult_product_descriptions.product_id IN (
    4135, 4814, 4845, 4846, 4844, 4848, 4847, 
    4849, 4843, 4842, 4850, 4855, 4851, 
    4853, 4852, 4854
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_ult_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id", "company_id"],
      "key": "product_id",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_ult_product_descriptions.product_id in (4135,4814,4845,4846,4844,4848,4847,4849,4843,4842,4850,4855,4851,4853,4852,4854)",
      "attached_condition": "cscart_ult_product_descriptions.company_id = 1 and cscart_ult_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id	full_description	search_words
4842	<p>IMPRES Industrial Noise Cancelling Microphone Submersible (IP57)</p>	NNTN8382A, XPR 6100 Speaker Mic, XPR 6350 Speaker Mic, XPR 6380 Speaker Mic, XPR 6550 Speaker Mic, XPR 6580 Speaker Mic, XPR 7350 Speaker Mic, XPR 7380 Speaker Mic, XPR 7550 Speaker Mic, XPR 7580 Speaker Microphones
4852	<p>Includes a 3.5mm audio jack for discreteness, volume switch for flexible use, and 18" straight cord assembly. This microphone also has a number of advanced audio features. IMPRES audio enables communication between the microphone and radio, optimizing the microphone's speaker output and microphone sensitivity, resulting in more consistent output across all radio accessories. The windporting feature dramatically lessens background noise from high winds and other severe weather conditions. The PSM antenna is sold separately under Antennas.</p>	PMMN4043A, XPR 6350 Speaker Mic, XPR 6380 Speaker Mic, XPR 6550 Speaker Mic, XPR 6580 Speaker Microphones
4853	<p>This submersible (IP57) microphone includes an antenna for increased coverage, volume switch for flexible use, and 30" straight cord assembly. This microphone also has a number of advanced audio features. IMPRES audio enables communication between the microphone and radio, optimizing the microphone's speaker output and microphone sensitivity, resulting in more consistent output across all radio accessories. The windporting feature dramatically lessens background noise from high winds and other severe weather conditions.The PSM antenna is sold separately under Antennas.</p>	PMMN4047A, XPR 6350 Speaker Mic, XPR 6380 Speaker Mic, XPR 6550 Speaker Mic, XPR 6580 Speaker Microphones