Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf61abe5cd4b4f2ce016d7d52eab0c8d902d22f4798402a13810cf5292ede411' 
  AND token = 'ikz7+sgBTyDIrmyoNFdIg6w/KmrisTSB9XU1zswitQ4=' 
  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"
    }
  }
}