Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa23cd5af5aff563320edb2f52ad4cd29106f2d23ebdee758e838b75c5107b43' 
  AND token = 'nUI6EdsSpAR/LC4nJxTDFjAQ/mlUJN5y8ps55++0ZG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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