SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9c51493830bd959915cffae258883473882b7334f80bd76b2cc6609f80a4f03b' 
  AND token = 'vO5CiGom77UU7XpCXwMf/B1+t/BzkyqZXrXlmLEL/qs=' 
  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"
    }
  }
}