Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b77999b6d516281effc2ab4b0a4cf5b14a2628932375d50bf756f0fa146f8f0' 
  AND token = 'l7T/JGP9KaXpHxO29o5sc2plwXLj287WScGok2oxLfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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