Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1503d24d64b8533886afc9c3a8f8aaedcb93e6e8e8d8ef7c8f014d4613e37d52' 
  AND token = '5nnDafvYkLhBWF+oiXRLmt9JGnKpatNmUn3xzCH205s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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