SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0cf760ad6e55e15063b55c9a339379884c804fdc8ba2a890d23b41e1c93132' 
  AND token = 'X4LXzdzwQcS7gVKvwriqO6Y/cKWTeom8bxrcdpnBjCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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