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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 (
    4718, 4793, 4774, 4776, 4775, 4078, 4779, 
    4777, 4792, 4787, 4858, 4786, 4790, 
    4778, 4856, 4860, 4796, 4797, 4795, 
    4794, 4857, 5006, 4878, 4112
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00030

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": 24,
      "filtered": 100,
      "index_condition": "cscart_ult_product_descriptions.product_id in (4718,4793,4774,4776,4775,4078,4779,4777,4792,4787,4858,4786,4790,4778,4856,4860,4796,4797,4795,4794,4857,5006,4878,4112)",
      "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
4878					APX 1000 Headset, APX 7000XE Headset, APX 7000XE Headset, APX 7000 Headset, APX 6000XE Headset, APX 6000 Headset, APX 4000XE Headset, APX 4000 Headset, APX 3000 Headset, APX 3000 Headset, APX 4000 Headset, APX 4000XE Headset, APX 6000 Headset, APX 6000XE Headset, APX 7000 Headsets/Lapel Mics/Surveillance Kits