Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5734f678f39abf55b7d3977e0f712769e1b9b91fb26954861f4f5d80d67c48' 
  AND token = 'ciWB8yWNIxNvMQCZJ4H229e5zCtfrJEqFK53naE2CFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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