Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99df9c7fa8b31dcdc2ad366754939d0220e1469f00b206f8ab583d6a30a4bc3e' 
  AND token = 'Ejl7FUYy00TIClqK49+BQntTHmAJBgP508z6pAVVba0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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