Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af1374b0c412cab4974b29e3c1c521c69b4ed0c9560eb4a7ff20726a2f3662a' 
  AND token = '0WiuyM0/7vkl1IHWusR9XnJr8z0JtfhHI9THY+f6OrE=' 
  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"
    }
  }
}