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 (
    4896, 4889, 4894, 4891, 4895, 4890, 4892, 
    4893
  ) 
  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": 8,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (4896,4889,4894,4891,4895,4890,4892,4893)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
4889 <p>Tactical PTT/VOX Interface Module </p> APX 3000, APX 4000, APX 4000XE, APX 6000, APX 6000XE, APX 7000, APX 7000XE, APX 8000
4890 <p>Tactical Boomless Temple Transducer (requires Interface Module PMLN6765 or PMLN6827 </p> APX 3000, APX 4000, APX 4000XE, APX 6000, APX 6000XE, APX 7000, APX 7000XE, APX 8000
4891 <p>Tactical Remote Body PTT (for use with Interface Module PMLN6765 or PMLN6827) </p> APX 3000, APX 4000, APX 4000XE, APX 6000, APX 6000XE, APX 7000, APX 7000XE, APX 8000
4892 <p>Tactical PTT Only Interface Module </p> APX 3000, APX 4000, APX 4000XE, APX 6000, APX 6000XE, APX 7000, APX 7000XE, APX 8000
4893 <p>Tactical Throat Microphone (requires Interface Module PMLN6765 or PMLN6827) </p> APX 3000, APX 4000, APX 4000XE, APX 6000, APX 6000XE, APX 7000, APX 7000XE, APX 8000
4894 <p>Tactical Ear Microphone (requires Interface Module PMLN6765 or PMLN6827 </p> APX 3000, APX 4000, APX 4000XE, APX 6000, APX 6000XE, APX 7000, APX 7000XE, APX 8000
4895 <p>Tactical Remote Ring PTT (for use with Interface Module PMLN6765 or PMLN6827) </p> APX 3000, APX 4000, APX 4000XE, APX 6000, APX 6000XE, APX 7000, APX 7000XE, APX 8000
4896 <p>Tactical Temple Transducer / Boom Mic (requires Interface Module PMLN6765 or PMLN6827) </p> APX 3000, APX 4000, APX 4000XE, APX 6000, APX 6000XE, APX 7000, APX 7000XE, APX 8000