Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5ad3f588783612740b6276af707bfe33bb73f7ad270a5ec3fcab4ed1e5efb1' 
  AND token = 'gG0Nqwr6wCINTBiZsfbsAW5Eo+8zLl4Zai2pO7u4qqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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