Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bd82c130b5790eddf1a12d38be41e94d8eb446c70fad9d570a96a746f292d9' 
  AND token = 'q4VY76L3MQHf8pyE3Z3ET/82H3zkamiT+qTEIOeAhbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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