SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '871548f29f2d927c8b2dd773903b89783a5e2b49ff84d2939ef890b1cf54c58d' 
  AND token = 'ipYelZC7ZuVHxuzYHnYR2nE/6y/NGyB30bB7Ky9LTzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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