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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd417956bfd20ab50f0cefc9b03b9bf1be562f1f1cc026153f77be74602091d88' 
  AND token = 'M6fDrjvJ6XilDlbkhjTIfIF9b+Z1tVDRUHuE3McTaak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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