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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15837267553c292f2ac523ef1c1b0b91686a820517ac3b43f60c786134ee255d' 
  AND token = 'tbOxU8hGWue++8adggQGIE9bs+i7p+H6iqSpgRfbKPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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