SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c28049b5e745f60d73f826feef96d1b7817089863dd9176245484b3d3a942a2f' 
  AND token = 'Yq6feBTGxjKpDv1Tt73KI977Vyn8EJqDUpkFauHjAmk=' 
  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"
    }
  }
}