Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be99dda98d6ae66b6d2cdf0b43a2c35b36cc8bef256039e0d20757c28a8cfbaa' 
  AND token = 'Y4Xd69xMkkB7jKvtjVjeyoNsmFDCKiAMhSDp9DyU7Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}