Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392b1b01c290b759c555aa82da9f1c1577fc87e382f6d6f12a76890e918dc928' 
  AND token = 'UjRdZbhm3FFgkESHuLgIY7XH5BNi/OE7PjoivNW7o40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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