SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee4918fcdbc6b02e7c4ceb13c6d660522ea17fb4c8fa2206dd541a073a0ce3f' 
  AND token = 'jqhjXAD1uA+7UTwvwrJ6v8uVYzoHvBVHChDxpUbKmzQ=' 
  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"
    }
  }
}