Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c1956525afee059c3936e81f3ce50ccc8b1bca9467731b1f31c24813d76ece' 
  AND token = 'FBeSerix8pMUos2aZ+VmdIfamqTfERZJn3fH0jcl5EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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