SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    64906, 64902, 64944, 64875, 64866, 64901, 
    64874, 64946, 64865, 64867, 64907, 
    64900
  )

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 12,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (64906,64902,64944,64875,64866,64901,64874,64946,64865,64867,64907,64900)"
    }
  }
}

Result