Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c4861d9e352c3605c341959dbb05e31e2d1f8df3702d4dffcee4d119769cf8' 
  AND token = 'ZSZmQoXPEpcDYYpA4YtlZW7x4bWeWOK9FJPKMexA7v4=' 
  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"
    }
  }
}