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 (4681, 4447, 4448, 4449) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00021

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 (4681,4447,4448,4449)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
4447 NAF5087A, XPR 6380 Antenna, XPR 6580 Antennas
4448 NAF5088A, XPR 6380 Antenna, XPR 6580 Antennas
4449 <p>This 18cm GPS combination helical antenna is for the 806-941MHz range.</p> XPR 6380 Antenna, XPR 6580 Antennas
4681 <p>VHF/GPS combination stubby antenna for the 146-160 MHz range. Stubby antennas are ideal when the radio is worn on the belt as they are short and unobtrusive. </p><p>Compatible with the XPR6000, XPR7000e and XPR3000e </p><p> Note XPR 3000 radios do not have GPS capability, but still use these antennas. </p> XPR 3300 Antenna, XPR 7350 Antenna, XPR 3500 Antenna, XPR 7550 Antennas