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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e0459e0205d4f7cd02c2aaa9033c0a44dd0e87d975242bfae92ae1ef4e2182' 
  AND token = 'dZEe2GbZr6fm/wuOWnmFcHQ/OuTNSJHoLnE8aPC7A2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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