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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '349f4709cec95978d2d9d16ee1cfcb9525dd2af8fecbe45a9b3dbd74fe5c2bf0' 
  AND token = '6LcDW/I8iefmg963c025P+Alf4F25M18zbw9YZMsDkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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