Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5810e52f8532286f53b125359391fd889c8ba42fe00960974294059debea8d' 
  AND token = 'W0YL5QGGgse450h+333MFxqtK8KHEFYJKhhjKCQX/Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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