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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bdd56d850dfe2e8817bec060668975df1dea1e02247f84ef05cb2013e75e94' 
  AND token = 'oJ3sxVDawJMXN3sLxRVYDLz0N4Ym0ET390J+7NcxqLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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