SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c24e99214b8c3d6086523b87fce7d0f0c0bfff38797d25e4508fc6d7ca582d90' 
  AND token = 'q2sORxcMP5w1VutyTGyyOYrW0uAhpBh1o0ZG2+xBvGQ=' 
  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"
    }
  }
}