Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fbd1da7fabf0af2bc4cc6d63d03aa27cd9c9ed8231f93275ca96276b8ddd30' 
  AND token = 'RoPevdhAKD4ehvuug2waUxHs9D0xcrTb7hunSuIeIf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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