Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2cd08589773211d585aeaac631cd5cfebab5a13d4c9a8a84452cdcb778a258' 
  AND token = 'QqPc8WF5jrYdadMMpFfDgVqHEMI+7QLOtYArriIUnlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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