Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d837d4864492836259205c87c98311e114fe43ce3f7709b261e43c15e16c3a7' 
  AND token = 'QPiJjZSdo93L1shArStBviIUO6NKF1cCsdWPajLMQUQ=' 
  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"
    }
  }
}