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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 (
    4759, 5062, 5032, 5031, 5005, 5902, 5033
  ) 
  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": 7,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (4759,5062,5032,5031,5005,5902,5033)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id	short_description	full_description	search_words
4759	<p>12V DC Travel Charger for APX6000, APX7000</p>		APX 6000 Charger, APX 6000XE Charger, APX 7000 Charger, APX 7000XE Chargers, APX vehicular charger, APX travel charger
5005		<p>Motorola PS000150A11 - Micro USB Wall Charger, 7.5W 100V-240V (US Plug) for APX8000, TLK100, EVOLVE, SLN1000.</p>	TLK 100 charger, EVOLVE charger, EVOLVE adapter, APX 8000 power adapter, APX 8000 charger, TLK100 charger, APX8000 charger, APX8000 adapter
5031		<p>Charge IMPRES batteries up to 40% faster with this IMPRES 2 multi-unit charger. </p><p><span data-bind="widgetLocaleText: 'dimensions'">Dimensions</span> (<span data-bind="text: msiDimensionUOM.value ? msiDimensionUOM.value : 'IN-Inch'">IN-Inch</span>): <span data-bind="text: value">7.5</span> <span data-bind="widgetLocaleText: 'width'">(W)</span> <span data-bind="text: value">17.5</span> <span data-bind="widgetLocaleText: 'height'">(H)</span> <span data-bind="text: value">10.25</span> <span data-bind="widgetLocaleText: 'length'">(L)</span><br> </p>
5032		<p>115 VAC single unit IMPRES desktop charger for the Motorola APX6000, APX7000, APX8000 Series radios. </p>
5033
5062		<p>Trunnion Mounting Bracket </p>
5902	<p>Endura vehicular smart charger for Motorola APX6000, APX6000XE, APX7000, APX7000XE, APX8000, APX8000XE</p>		APX 6000XE, APX-6000, APX 7000, APX-7000, APX 8000, APX-8000