Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6812f898b5e0ee3b97d221206aee63d39ecb46b00984934973d20530b32a7b1e' 
  AND token = 'KwtBYDMMPjWcW/w2V2wlxdsLcHQzc0GGPIloutjRDNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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