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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6322027be345e6418ee4e3eb4cd0226246b50e6fbf8593944455040baecd599b' 
  AND token = 'xYp79T2eOHo2s3f/ZAAJVY0idrGTooOlIT56loETtYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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