Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5f3c54f7700d63d28c29aad374e9c9a1f6732b340d92ef610a3937b8a72d6b' 
  AND token = 'wtugwHig3qwZwmyoBe6UvW8HsaT9fD03uybELAQysQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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