Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233b70b74e3f91b3de476ff42bf6ef7fdf2ae3d78816797ffc973865c35feec4' 
  AND token = 'onHGD92X2mAk2Zgfs/s2ZmRg+sXtszpx5uG+aq+Vtv4=' 
  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"
    }
  }
}