SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1906e5abcea8f0310ef67e2c51a516e34b2420abdc2206565dc9c0f59f08d8b8' 
  AND token = 'Mcj7kC6CqHMtKhvGBv217rTvGUYUhfMsQU2+vKgV2/g=' 
  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"
    }
  }
}