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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3b6c5e2463fc5ba5731c054faf1a36ecf0dee573df9bb6af08dab58d902057a3' 
  AND token = 'cesYDvkhfIH+eClwE6QUlh7sJJE5u6smVD4p7sAO8Os=' 
  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"
    }
  }
}