SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55f2143980a5c47ab832725c966a496524991c75086ef67583e3beff6c6de25' 
  AND token = 'txlqX1cwqXJBpkhk0LQph+Pq5bznLDhlWU6Ol7SvwZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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