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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1045c1493b841de58cf960f1e48a52a694cd526aa0ca3bcd18fb1e04d0c413cd' 
  AND token = 'ceKebHqfjn9+kxcTZJ/Q5+7b/Jxs/zgRxpPMlFZDtGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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