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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 (2085, 2082, 2083, 2092) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00020

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": 4,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (2085,2082,2083,2092)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id	short_description	full_description	meta_keywords	meta_description	search_words	promo_text
2082		<p> BLUETOOTH Lapel Microphone Unit with battery and charger.  Professional unit designed for two-way radio users. Features wireless PTT and 12 hours of Talk-Time. Kit2 includes Acoustic Tube Earphone.</p>
2083		<p> WIRELESS (BlueTooth) PTT Switch.  Includes Battery and Charger.  Compatible with ALL PrymeBLU® Portable and Mobile Radio Adapters.</p>
2085		<p> Bluetooth Headset Adapter with 5 pin XLR Connector (Fits Pryme and other Headsets using 5 pin XLR connectors). Converts Headset to WIRELESS Operation using Bluetooth. Compatible with all PrymeBLU® Adapters.</p>
2092		<p> BLUETOOTH ADAPTER. Compatible with most off-the-shelf Bluetooth Headsets (long talk-time recommended). Use the PTT button on the adapter to Transmit or add Optional BT-PTT switch. Powered by the radio.</p> <p> Fits latest version ICOM Multi-pin radios including: IC-F3261, F4261, F9011, F9021</p>