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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, 4823, 4832, 4814, 4819, 4820, 4821, 
    4818, 4816, 4822, 4817, 4815, 4827, 
    4825, 4831, 4830, 4829, 5061, 5060, 
    6028
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00025

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": 20,
      "filtered": 100,
      "index_condition": "cscart_ult_product_descriptions.product_id in (4135,4823,4832,4814,4819,4820,4821,4818,4816,4822,4817,4815,4827,4825,4831,4830,4829,5061,5060,6028)",
      "attached_condition": "cscart_ult_product_descriptions.company_id = 1 and cscart_ult_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id	short_description	full_description	meta_keywords	meta_description	search_words	promo_text
4822		<p>Receive-Only Earpiece with translucent tube and rubber eartip (for HMN4104, HMN4103 and HMN4101 only)</p>			RLN6424A, APX 1000 Speaker Mic, APX 3000 Speaker Mic, APX 4000 Speaker Mic, APX 4000XE Speaker Mic, APX 6000 Speaker Mic, APX 6000XE Speaker Mic, APX 7000 Speaker Mic, APX 7000XE Speaker Microphones