Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7d2aa986df376c9cd248be86403b85d6fe837c64d990d5bb2b4a2f853e21e8' 
  AND token = 'XGScFpAoQkT5exuZw4H2us75QT5JzwiKryEio2ibhk8=' 
  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"
    }
  }
}