SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f48d9cfdf6773312066feb8646492830d3499f87ac6c4a8f1209374e6d6a4820' 
  AND token = 'qD4+/VJRsMQvkK4zw/VTgH4JtjxQ/U0NnF+JrganCcI=' 
  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"
    }
  }
}