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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817bdd31657ec8a6704d5c9568d6cf0fe9db35d0b95e008f2adcc337ea31a357' 
  AND token = 'wh1iFWo6V4x0ekzmgypEJfXz4NbVQA9u0/7NYQ9lc8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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