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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72b23c04508e016abef9506328e0938e253f31e59b880a1217a596d26489e94' 
  AND token = '+HkB3XhfgSam7jJbK8DUqIwa7CawHUTpMam8k7iyh/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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