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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aef05d5e0b76c8889e306ecadc36d5ba8b991f19e077645dcd416fbd1b06b90' 
  AND token = 'jWUPB0ihqYi56174wVofjjjkHGvFd5wjtjAY117M2bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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