Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36dea1da38681093516fe18e89cbdb5d60b7972efb1c2c16f71a6e8fce723d91' 
  AND token = 'No8MwbI5VhRxsV98zE+NmzaSysTQuDIDbI/6BVRfpcg=' 
  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"
    }
  }
}