Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783d08e658d1e9d57905adebe70f650462ce85cf2db600eef80474f3ba03a650' 
  AND token = 'g0HI4NtMvFf4pCebO54vBc+jozspoXDQCqpdPL0FtEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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