Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdf4856fdfbbd39e9cd11d33f23641e0ba6f5e2717a2979b15fb741182de98b' 
  AND token = 'moQ0eCXmtWQXL1DEz4Z05Ku/d5phrJr/zObJRJOcvm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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