Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d1236d920c337323bedebc53ddc4632d786c9ec4a33df98a9b28c874091d5d' 
  AND token = 'ufjHCp/JWqKTJ8bp4ocJ+MB4QXTUcNcXq4GHxgpt3zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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