Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bc7e295ad5a42c074158c5878381436f642bcbeded69fd22a1eee15c05c541' 
  AND token = '3uv/m/O3+r6+09ZK9LBmCw2ytT5ozHI4Sy0vUNDVrJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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