SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f038d4bb2f20d72262885544936c1dd45bfc06af902b97a0a5720d7a2009ffd' 
  AND token = 'aYQvSXnhR8rZCEDuGwfrhkUzY6BnjIK5Rzsi1KPhwL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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