Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c0df843932c62442326ad3d1dc16e3469a12a4f70260f28c6047e0f45ad897' 
  AND token = '8AQ/SyCkmjnjMD4yRWytYm/qtPdQwcR5hFyFqOWcYdg=' 
  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"
    }
  }
}