Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bfbe4bfcb4f6b034a655848dea76071fac681277a1e3d8a078c33b98df384d' 
  AND token = 'RQMslb5El9guhA14qqQ8XFO8k9gRFSCOAw9+iZFv8zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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