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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3a5b627b975c3281f8d661b377b2065717c79087ec53e788768004f31e84a6' 
  AND token = 'SamnINq+RBB9ZHd98OZQUHJ3qPDGox7nF90OaNXuxQ4=' 
  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"
    }
  }
}