SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b36af0714311fc74b4b1a96a63472ed6a21b9b8b201118ffcc57930a4d6c70f' 
  AND token = 'geJc2YJjh6KFiQgmDSqRl99uCu5heH4IhJzjUD/LGjY=' 
  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"
    }
  }
}