Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcbef9e4acdd5e002c7c039e2af74a9404a0bcc0c368e762808fbe6ac5ae9af' 
  AND token = 'b4rorB52kWlis1Pwscuvm++PuB9aWVX/JJs9XXDGSK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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