Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f83d485a6f8f0a4aec9f14842ccb5031e81290a7e35d9ebafd63fc6f1a35c5' 
  AND token = 'LP9Xvg50Dyip2LdQIRARNwbYd5XdVN//wDuv6qrHBHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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