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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 (
    946, 947, 942, 941, 945, 944, 948, 952, 
    1005
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00023

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": 9,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (946,947,942,941,945,944,948,952,1005)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id	short_description	full_description	meta_keywords	meta_description	search_words	promo_text
941		<p> <span style="line-height: 18px;">Spare 32GB SD card pre-configured for recording. 3 year warranty.</span></p> <p> Compatible with FC-ADAPTERDUAL.</p>
942		<p> GPS Antenna option w/cable - records bus speed and provides map data during video playback. 3 year warranty.</p> <p> Compatible with the SVR-4100 and SVR-4108 DVR Systems.</p>
944		<p> Impact sensor (triggers recording automatically). 3 year warranty.</p> <p>  </p>
945		<p> USB 2.0 dual SD card reader. Required to view video recorded onto the SD-32G. 3 year warranty.</p>
946		<p> Interior high resolution day/night color dome camera with built in audio and IR illumination - available lens sizes 3, 4 & 6mm. 3 year warranty</p>
947		<p> Interior high resolution wedge day/night color camera with built in audio and IR illumination - available lens sizes 3, 4 & 6mm. 3 year warranty</p>
948		<p> Exterior high resolution wedge camera with built in audio and IR illumination - available lens sizes 3, 4 & 6mm. 3 year warranty</p>
952		<p> System Status Display/Event Button Module & Cable</p> <p> Compatible with the SVR-4100 and SVR-4108 DVR Systems.</p>
1005		<p> SAFETY VISION:  Spare 1TB SATA Hard Drive for the SVR-4108 DVR.  3 year warranty.</p>