Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ac8560e3c96a9a05b27b1ad3a480a95dcf44b55d8e3051a7c7787fe7d8bbe2' 
  AND token = 'gHtPI710vzscHpDdXh7G5E/5BPiJIkH+EdgyQETObVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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