Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700a5beef3dd1b6a926fd174e98130b7d2d1a713f8d548a6626c0015aa8a7d6b' 
  AND token = 'EdJO09Aax4ytAkE/33rOcsIJvtj/ndAwbYeXYC/AiSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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