SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7bae98f97438b2392bbc39ff6c8a77316e2e58ec3de0b6aeff80d768fb33df' 
  AND token = 'MIu0hxjJrSK8IT5UVUWrmKrZuJVlrhj14nTmT+V/lKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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