Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84f88a036b78e78e4c0398cb428434b081f1cafcf800c8c0fe497744944d8f4' 
  AND token = 'IWr1GVP6WGHGjpF0TEo4w6aeNbZyMZsAKKCfrZWQhRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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