Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a9873aa35bde5a38fd8061f6ac9865f7016dee089e002cc540d96ec7239194' 
  AND token = 'M8RQKH0BQnKUOTljhvBi4iPnxc7TI9MxZdGrnBrCQuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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