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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f390cc4d72e2e13c26911784b8bec17f806b4fadb9fb9572646f93947ce1e3de' 
  AND token = '1I/OnKHV/xwR6NrB3/oUK6vUiqu/auf8NvuESWUe/xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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