Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2711559dd811742d641d72722024392fac0670867f8487da4a76f9e12936cbf4' 
  AND token = 'r2nyIny4GPzoDESDw5hlSazpgVGtqKJnOhdbhOby6pE=' 
  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"
    }
  }
}