Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc83e289df3dc4a4d2258f59015d2c12607a283091477b3e2786e7b320aff68' 
  AND token = 'WnWyJ+dcslo//SdJKdKf7DJNnn8zxtlcOc6N3rAMNYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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