Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b04b8ba51154a54494d12826ba0231fd48523996ddaa87efe1203bcb15d6387' 
  AND token = '5MTzYiQfnzIIWWXKKD6LQuyZ7wPPFEZ5Nr4yqhT5urM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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