SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf0249ec412566de6558cafbc47cdcbb1b7ad86046a3239ffc48ae7cd95192c' 
  AND token = 'mLHZQNKWP0AG+KOauXVUvMaejcqIDEfV26B8OY8MWUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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