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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f2fd39ed39a6a8fc3fbd063a62da58dde6ec3bf82b9c0add0014911b77b198af' 
  AND token = 'Nm+yzcl9mcFwEF1mczHUxZTdoCOW0BQ0Y0PFU/ZTQKQ=' 
  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"
    }
  }
}