SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be01a7d7d7292be0ee2740381990a85d9a022d69af533d37a248dfc64cd58729' 
  AND token = 'gt88ESIZRjUqwVuiKVfF1mgiGlTBsq5jBNLQa2SF5OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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