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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8d852d4f697300ab60ab7ad9458c39e17336ba1f4d0a92de681af9858f68a6' 
  AND token = 'yoKNgNpuYK3xa8e+4bFAJEgK61AnOjWl/+wcL31hDlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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