SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1acb67ef3fc8fff5d40a09eb156b8b9d428290d746bc6a380f1462d97f8c39fb' 
  AND token = '/xuFCDu0BdlNXGR+HRHKLE/tZulrcU2hPK2zuPjnfho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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