SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97af04ed7abdf8396cda3f46feb46f51f41df4178c03b15304363843beaf45ae' 
  AND token = 'fuWUwWOHZu4wVJKf/P4eFv+tNiYqvgZFrQ5jxBecWw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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