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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fd4ee85d479e1f99dc2388908a1ca5a84f73a1479679308b6122e0eb7a2888db' 
  AND token = 'ZbKtfKGCdeLNdE9qEVBZo/rg63hRvlTNBrqEkPR/cv8=' 
  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"
    }
  }
}