Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db09f08856b1ebf5e91e1c726f2a6474296a50e68a46c9ea604d387efc4a60d' 
  AND token = 'p+dXWsYlbS8ZMJ+mmgBNq9sx8IKR4asL034XfQ/kci0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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