Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8ecd1595d608d20bd7e02a8c58aab3219498890f587777791f7ddfeb067a9d' 
  AND token = '/G6x78d/ZDAdhDxKYwiQvue0Nyzm9BSxQoqHngGKOwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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