Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ff8fec6d2aaedd4922b40ace1d98f3bd38735f7bcb1e63c8171e4ab15ca7a6' 
  AND token = 'UO3rEWTw8tF3h+yK/xFuoxxx6KQd8xESL3fOox0F4P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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