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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c55724ff239e9b0c27de77583ea7c5ab535394cb95b825c5c518ca5019a9343' 
  AND token = 'hbHVuU5FlG71mn+ztFF6Bj1y/YSdwAzNtYy0WMHLnGs=' 
  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"
    }
  }
}