Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992c3c54c66091dafa8d7cad115c13b7db092de3de92c3015a1bdf8867f93604' 
  AND token = 'TQaVdvWU3mGNLerfGL4zu0pbBMEf9joT1IOkMiIN6vA=' 
  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"
    }
  }
}