Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586274d3e73e4a9ca36cf1b04c935d4f51968ad16828741375eea21a2c38c466' 
  AND token = '9h4mw7XEd3UflDX+yzW+hD26sJMrBhJ83Xm2oW+n8Js=' 
  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"
    }
  }
}