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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5a170eeef44ad18f1b9c8913890defa81b53e44eab51aec2b99e4706dcc0c5' 
  AND token = '/yeDtjM4utukpyx4BDIe9g7QxagbF+bqjr5AtRVgpgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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