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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dac99ce137d953c69b1da40e5e658c7fa067404b0f59ca6daef24aea73218c1f' 
  AND token = 'CHkkif4KVbClQ+oLBuP6fsQ89CFwaKxbN+JbpNCvLTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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