Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee760319506825f1dea1be01d008f4b4bcbb2645a8a8e05e4dbaf7732b3f70f' 
  AND token = 'd4cEi79oUN9+JimXpJ69s5kwI0tKNzZuZAXSO83CdZ4=' 
  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"
    }
  }
}