Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b68b7bf39e058f5bcbf8f2b0b4412911187421335bb245658ea9e53b242b451' 
  AND token = 'QWCh7e6es1ZoJMhm1ajyi4S5Hxm1wi1JoRLBCouD8tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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