Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d04cffa5f12cd93f4f4e5ed2898ae27693423a99d4eef81be40a015c6abade' 
  AND token = 'rQ/+784G/D+nkWCQBn1l3ImBZS7DeaEm9WX/XvDwFqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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