SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895fc1a69a77ce4eeb76d1f9493fead3cf6ec0e3c2da8b6024017687d2996949' 
  AND token = 'I6ZytwtE/RLvxUFqGbVm/xpCKJ0TVjxo9ylfDaNQPVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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