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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f8643b62d10b5f0d207015f569cf57a6985e8f7c9f7d19a8fc0a33216bb0616e' 
  AND token = 'D0noTDJ4Ng+qxBNDpbvqKXTqC427Aom9t0pmShJYFAM=' 
  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"
    }
  }
}