SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c6c58d5842a83c2671cb8ff5cb35f8bd20d799b6bad2032550ff7785011be899' 
  AND token = 'wPVnD78YKrgLRiaPEZJN1svj8lSVrSduGXTC8J7PRNI=' 
  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"
    }
  }
}