SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e098200c233eb66c7cbf930bac4f133a6a6798583d7944ca66b7574f52ad42b' 
  AND token = 'YLAxSUClMBb901C/1McCaJZ1jPqvFUXPOlpjkoIGKEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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