Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4718d629365898dc8ec6822e0fdac9221652ef4a1b23262a547ea37bdd374c6' 
  AND token = 'ZdoQDDHCM1co3Ic1Lq/do6trY+nJAjj2UXbEJRL3u6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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