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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964bd9157f392edf535a2893efb70b75b75b0abb033f025a8ab17dfa242138b4' 
  AND token = 'bgyXaCrv2+jL8wbQJsAZB15kKkgX0Hu2zYBizaD4wAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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