SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ee310c9496bafa2a5e600c48741ed350a8b7977cad30833db4f73dc1cc06d828' 
  AND token = '5LxVqVkKFKV3PMV7lDbgkDkuRhz9nzKsHi6tKZxvRrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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