Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c31e237db2cf94692dbc4201fdb223be948c18cd264611e3a07dd5f10d7f18a' 
  AND token = 'NMJdCHqI8yoMFQY4UqjAHgHzmgaOFQlbtuJ/q0d1TCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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