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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2edbd69ee2b4e04c9511de3db65e8470bdd06a9175d7f8e5d91026959b5b9d2' 
  AND token = 'lr3pEV1Ab88GbsTTfCMVUpwuOIyf6sy7vZjGYrNNVkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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