Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b12744b07ae299cd23fa2392b88ab1aaed9eac2ff4521937ac2929048bda1f' 
  AND token = '7RMsEs3UXCEtu2yaXSfBqFLOPdYdz80XoQiLdRqpxjk=' 
  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"
    }
  }
}