Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a52a9ec8dedc8cd50307622a5b9bf2685daecdfd209a90a5b2029535180ae9' 
  AND token = 'Y4IApzSCB3pxxuYRQRb3/y/W3hhqnarN7mE8ndgCRk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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