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 (5616) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "const",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "ref": ["const", "const"],
      "rows": 1,
      "filtered": 100
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
5616 <p><span data-bind="text: label">Audio Jack</span>: <span data-bind="text: value">3.5MM NON-THREADED</span> </p><p><span data-bind="text: label">Channel Control</span>: <span data-bind="text: value">No</span> </p><p><span data-bind="text: label">Display</span>: <span data-bind="text: value">NO DISPLAY</span> </p><p><span data-bind="text: label">Intrinsic Safety Rating</span>: <span data-bind="text: value">NO RATING</span> </p><p><span data-bind="text: label">IP Rating</span>: <span data-bind="text: value">IP67</span> </p><p><span data-bind="text: label">Microphone Type</span>: <span data-bind="text: value">WINDPORTING</span> </p><p><span data-bind="text: label">Programmable Button</span>: <span data-bind="text: value">ORANGE EMERGENCY AND MULTIPLE PROGRAMMABLE BUTTONS</span> </p><p><span data-bind="text: label">Technology</span>: <span data-bind="text: value">WIRELESS</span> </p><p><span data-bind="text: label">Volume Control</span>: <span data-bind="text: value">Yes</span> </p> WM500, WM-500, PMMN-4127, PMMN4127A, PMMN-4127A, Bluetooth mic, Bluetooth speaker mic, TLK100 microphone, TLK100 BT mic, TLK100 bluetooth mic, TLK-100 bluetooth mic, TLK 100 bluetooth mic, R7 bluetooth mic, MOTOTRBO R7 bluetooth mic, R7 microphone, TLK110, TLK-110, TLK 110