Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ea35b6d8aa9c3ad8d9806fff142696b49508c19e7ca4be03942e0872656674' 
  AND token = 'Hgb6TtUkP52q8mj7x4P4KzWA3ojh//1JdGNdA+/ArF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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