Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d2e56f7d2b86edc1caee971a4d26591ce3f8cf5179418e731b1242fab36de5' 
  AND token = 'TADvDoSnweOAHgECxAXiNMNPVq6MzT/9IKVEGQU1NKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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