Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49815a215a23e71e07ab914f7d48b5d3935e6b2f5ab2d323045a53101b2f0c3' 
  AND token = 'W3nOlqldaq5GdAZjJXRj9XwhTMfTfQdPuSQ672ewTHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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