Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9048868d6c234e37fe6a23166c6589ff8b1a76d767f119ac934fe9f2693c4f9f' 
  AND token = 'QBTv5gG3tBAUdHt4FAMDPNzffI+PIOYP9UnuPeFDbYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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