Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4b25a0533bb62a533e91206788f3074639a021b098f826e3f6deab86f926ee' 
  AND token = '4oKW6rhkSskt/Tl94Gkio1vyX43jVfb9GarkHrMCukE=' 
  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"
    }
  }
}