SELECT 
  cscart_product_descriptions.product_id, 
  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 (302, 319, 323, 333, 475) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00021

JSON explain

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    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 5,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (302,319,323,333,475) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id meta_keywords meta_description search_words promo_text
302 Nikon, D4, D4s, Camera, Tripod, Head, Quick, Shoe, Clamp, Plate, Arca-Swiss, rrs, kirk, foba Markins PN-D4 is an anti-twist flange style camera plate for Nikon D4 series cameras. Compatible with any Arca-Swiss type.
319 Camera, Tripod, Head, Quick, Shoe, Clamp, Plate, Foot, Arca-Swiss, rrs, kirk, foba
323 Camera, Lens, Tripod, Head, Quick, Shoe, Clamp, Plate, Foot, Arca-Swiss, rrs, kirk, foba Markins PL-12N is a 4.7in (120mm) long lens plate for 300mm or longer telephoto lenses.
333 Nikon, AF-S, NIKKOR, 800mm, F5.6E, FL ED, VR, Tripod, Head, Quick, Shoe, Clamp, Plate, Foot, Arca-Swiss, rrs, kirk, foba Markins Ring Plate is product to minimize the effect of vibration while shooting and to provide better results with a long teleport lens.
475