SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6554ea2a75d8b1fe4c72a588d61ca68af6be6a944b4234ac94a1083905de771b' 
  AND token = 'p5UanxQBKozon5FJCS1wF3oK7PgVMSumdWWsbzvKLCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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