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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6646b0d8e41971c1d583c0ca8259187eac0f4bd402e83d75c1ba924cbc970199' 
  AND token = '6IZu8379mstpcTt0cB3lHiRLjRpeRxhjsD/oB2GUG+M=' 
  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"
    }
  }
}