Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7dccf55d6c416c6231f18daa2dd8eba0ff19e3cb8ad211c376aa1cda8a7d47' 
  AND token = 'cWnp5Oqe/o9EBba1RmxvMULKO1vA1BR/RmLAh6uZQmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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