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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '78b2aec3410ba5140048f2d909b5d60984a99a13bd930fd1ebecf70b6cca0d29' 
  AND token = 'TtLdC+KOoU6I3QvplMtnGUogWnpeo/u13/wHrRti/m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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