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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf82a15a42e9aa63eec5884f9d83471f7881645da3d7c7492e1b281a3944426' 
  AND token = '7sReJYRfVj59JlzPPyEz3trntyPSySV3keOZ0rSSrfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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